06 July, 2022

Guiding Questions

  • Who is the audience for these plots and discussions?
    • What are we presenting externally vs using internally?
    • What level of depth is required?
  • How defensible or credible are some of the choices we are making?
  • What is the story behind the data, inclusive of all choices?

Gas Transmission

Base Plot

Offshore Pipeline or Compressor Stations

Why not both?

Offshore Incidents

The 1970s: Anomaly or Expected?

  • %95.7 of 1970s-Installed incidents were on the Outer Continental Shelf
    • Compared to %79.4 in all other installation decades
  • A vast majority of OCS Mileage in use as of 2021 appears to be built post-1960
    • In-state pipelines offer a more balanced proportion, as we’ll see on the next plot

Offshore Incidents

Mileage Plotted

Unknown Mileage

A Refresh

Unknown Mileage

A New Issue

Unknown Mileage

Why?

  • In the original, I was separately averaging incidents per decade-year mileage
    • The revision is summing incidents and summing mileage to get a rate
    • Issues arise when you divide by 0
  • 0 Appears in 2010 and 2011 (not in the original plot’s time frame)
    • In these years, Pre-40s and Unknown Mileage was ALL Unknown
    • Despite this, a handful of incidents in these years had pre-40s install year dates
    • The old method to get averages would result in infinite values and an infinite average

Hazardous Liquids

Considerations

System Parts

## 
##                                 OFFSHORE PIPELINE, INCLUDING RISER AND RISER BEND 
##                                                                                28 
## OFFSHORE PLATFORM/DEEPWATER PORT, INCLUDING PLATFORM-MOUNTED EQUIPMENT AND PIPING 
##                                                                                11 
##         ONSHORE BREAKOUT TANK OR STORAGE VESSEL, INCLUDING ATTACHED APPURTENANCES 
##                                                                               503 
##                  ONSHORE EQUIPMENT AND PIPING ASSOCIATED WITH BELOWGROUND STORAGE 
##                                                                                25 
##                                           ONSHORE PIPELINE, INCLUDING VALVE SITES 
##                                                                              1459 
##                                   ONSHORE PUMP/METER STATION EQUIPMENT AND PIPING 
##                                                                              1581 
##                                   ONSHORE TERMINAL/TANK FARM EQUIPMENT AND PIPING 
##                                                                              1161

Base Plot

Adding Parts